J-Integra® COM to Java late binding type mapping and coercion

These tables show the Java expression used to convert a VB value 'vb' of the VB type on the left to the Java type at the top.

Note that conversions marked with a * can also raise Type Mismatch Error.

Java boolean, byte, short and int

VB/Java	boolean	byte	short	int
Boolean	natural	vb ? 1 : 0	vb ? 1 : 0	vb ? 1 : 0
Byte(0..255)	vb != 0	new Integer(vb).byteValue()	new Integer(vb).shortValue()	new Integer(vb).intValue()
Integer(16 bit)	vb != 0	new Short(vb).byteValue()	natural	new Short(vb).intValue()
Long(32 bit)	vb != 0	new Integer(vb).byteValue()	new Integer(vb).shortValue()	natural
Single	vb != 0.0F	new Float(vb).byteValue()	new Float(vb).shortValue()	new Float(vb).intValue()
Double	vb != 0.0	new Double(vb).byteValue()	new Double(vb).shortValue()	new Double(vb).intValue()
Currency(64 bit)	vb != 0	new Long(vb).byteValue()	new Long(vb).shortValue()	new Long(vb).intValue()
String	new Boolean(vb).booleanValue()	new Long(vb).byteValue()*	new Long(vb).shortValue()*	new Long(vb).intValue()*
Date	Type Mismatch Error	Type Mismatch Error	Type Mismatch Error	Type Mismatch Error
Object	Type Mismatch Error	Type Mismatch Error	Type Mismatch Error	Type Mismatch Error
Variant	As above depending on content

Java long, char, float and double

VB/Java	long	char	float	double
Boolean	vb ? 1 : 0	vb ? (char)1 : (char)0	vb ? 1.0F : 0.0F	vb ? 1.0 : 0.0
Byte(0..255)	new Integer(vb).longValue()	new Integer(vb).byteValue()	new Integer(vb).shortValue()	new Integer(vb).intValue()
Integer(16 bit)	new Short(vb).longValue()	new Short(vb).byteValue()	new Short(vb).shortValue()	new Short(vb).intValue()
Long(32 bit)	new Integer(vb).longValue()	new Integer(vb).byteValue()	new Integer(vb).shortValue()	new Integer(vb).intValue()
Single	new Float(vb).longValue()	new Float(vb).byteValue()	new Float(vb).shortValue()	new Float(vb).intValue()
Double	new Double(vb).longValue()	new Double(vb).byteValue()	new Double(vb).shortValue()	new Double(vb).intValue()
Currency(64 bit)	new Long(vb).longValue()	new Long(vb).byteValue()	new Long(vb).shortValue()	new Long(vb).intValue()
String	new Long(vb).longValue()	new Long(vb).byteValue()	new Long(vb).shortValue()	new Long(vb).intValue()
Date	Type Mismatch Error	Type Mismatch Error	Type Mismatch Error	Type Mismatch Error
Object	Error	Error	Error	Error
Variant	As above depending on content

Java String, Date and Object

VB/Java	String	Date	Object
Boolean	natural	vb ? 1 : 0	vb ? 1 : 0	vb ? 1 : 0
Byte(0..255)	vb != 0	new Integer(vb).byteValue()	new Integer(vb).shortValue()	new Integer(vb).intValue()
Integer(16 bit)	vb != 0	new Short(vb).byteValue()	new Short(vb).shortValue()	new Short(vb).intValue()
Long(32 bit)	vb != 0	new Integer(vb).byteValue()	new Integer(vb).shortValue()	new Integer(vb).intValue()
Single	vb != 0	new Float(vb).byteValue()	new Float(vb).shortValue()	new Float(vb).intValue()
Double	vb != 0	new Double(vb).byteValue()	new Double(vb).shortValue()	new Double(vb).intValue()
Currency	vb != 0	new Long(vb).byteValue()	new Long(vb).shortValue()	new Long(vb).intValue()
String	new Boolean(vb).booleanValue()	new Long(vb).byteValue()	new Long(vb).shortValue()	new Long(vb).intValue()
Date	Error	Error	Error	Error
Object	Error	Error	Error	Error
Variant	As above depending on content

Byte ByValByte ByRef

Java	VB	Notes and converson used.
void byteMethod(byte p1)	javaObject.byteMethod(123)	integer number ByVal. p1 = new Long(value).byteValue()
	javaObject.byteMethod(12.3)	float number ByVal. p1 = new Double(value).byteValue()
	javaObject.byteMethod(false)	boolean ByVal. If value then p1 = 1 else p1 = 0
	javaObject.byteMethod("101")	String ByVal. If value contains a '.' then p1 = new Double(value).byteValue(), else p1 = new Long(value).byteValue(). If converson error then ???
	Dim byteParam as Byte ... javaObject.byteMethod(byteParam)	Byte ByRef. VB byte is unsigned (0..255), Java byte is signed (-127..+128). p1 = new Integer(byteParam).byteValue()
	Dim booleanParam as Boolean ... javaObject.byteMethod(booleanParam)	Boolean ByRef. If booleanParam then p1 = 1 else p1 = 0
	Dim integerParam as Integer ... javaObject.byteMethod(integerParam)	Integer ByRef. VB Integer is 16 bits, Java short is 16 bits. p1 = new Short(integerParam).byteValue()
	Dim longParam as Long ... javaObject.byteMethod(longParam)	Long ByRef. VB Long is 32 bits, Java int is 32 bits. p1 = new Integer(longParam).byteValue()
	Dim singleParam as Single ... javaObject.byteMethod(singleParam)	Single ByRef.
	Dim doubleParam as Double ... javaObject.byteMethod(doubleParam)	Double ByRef.
	Dim currencyParam as Currency ... javaObject.byteMethod(currencyParam)	Currency ByRef.
	Dim dateParam as Date ... javaObject.byteMethod(dateParam)	Date ByRef.
	Dim stringParam as String ... javaObject.byteMethod(stringParam)	String ByRef.